Merge pull request #26 from pgerdt/fix-tz-linking-in-reinstall

Do not overwrite time zone data files during reinstall
Bump version to 2.66
[timed] API for getting a signal when alarm queue changes

Add public api for subscribing to a signal providing currently
active alarms which is emitted every time the alarm queue
changes.

See documentation for alarm_triggers_changed_connect(), and
alarm_triggers_changed_disconnect() in src/doc/libtimed.3.txt
for more information.